HBA profile widths w₅₀ (top) and w₁₀ (bottom) as a function of spin period. Left side: the blue and red dots represent the data (red: interpulse pulsars, blue: other pulsars), while the red solid line represents the best fit (non-weighted) and the red dashed lines represent its 1σ dispersion for w = A·P^-0.5. The fit is calculated using our interpulse pulsars, following Rankin (1990) and Maciesiak et al. (2011) (see discussion in the text). Right side: the blue dots represent the data, while the green solid line represents the best (non-weighted) fit for all the pulsars: w = A·P^{− n} , and the green dashed lines represent its 1σ dispersion (see discussion in the text).